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Scheduled Maturities of Advances (Detail) (USD $)
In Thousands, unless otherwise specified
Sep. 30, 2013
Dec. 31, 2012
Scheduled maturities of the advances    
2013     
2014     
2015     
2016     
2017 100,000  
2018 and thereafter 50,000  
Total $ 150,000 $ 161,558